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WFM90D and WFM91D Service Manual
Table 1- 1: Vertical deflection system (Cont.)
Category Description
Transient Response
Digital Input REF: Specifications apply for full screen height video input signal, with VAR GAIN off, 1 V Full Scale
or X5 Gain selected, and FLAT filter selected.
REF: Pulse-to-Bar Ratio:
X1: 0.99:1 to 1.01:1
X5: 0.98:1 to 1.02:1
REF: Preshoot: ≤1%
REF: Overshoot: X1: ≤2%
X5: ≤4%
REF: Ringing: X1: ≤2%
X5: ≤4%
REF: Field Rate Tilt: ≤1%
REF: Line Rate Tilt: ≤1%
Maximum Absolute Input
Level
REF: ±5 VDC plus peak AC.
REF: Displays in excess of 200 IRE (1.428 V) may cause frequency response aberrations.
DC Input Impedance
(Unterminated)
REQ: ≥15 kΩ.
REF: With input switch in the HIZ position.
Video Input Return Loss
REF: ≥40 dB from 50 kHz to 6 MHz
≥15 dB from 6 MHz to 270 MHz
REF: With 75 Ω termination on.
Video Out Return Loss
(75 Ω)
REF: ≥30 dB from 50 kHz to 6 MHz.
Video Out Differential
Gain (50% APL)
REF: Within 1% with a 140 IRE (1.0 V PAL) unit display. Analog input only.
Video Out Differential
Phase (50% APL)
REF: Within 1° with a 140 IRE (1.0 V PAL) unit display. Analog i nput only.
Table 1- 2: DC restoration
Category Description
DC Restorer Clamp Time REF: Back Porch.
Frequency Response
at 60 Hz (50 Hz PAL)
REQ: Attenuation of 60 Hz (50 Hz PAL) on Input Signal:
Slow Mode: ≤20%.
Fast Mode: ≥90%.
REF: Blanking Level Shift with 10% to 90% APL Change: APL changes from 50% to either 10% or
90% will cause blanking level shift of 1 IRE unit (7.14 mV PAL) or less.
REF: Blanking Level Shift Due to Presence or Absence of Burst: 1 IRE unit (7.14 mV PAL) or less
shift from no color burst to presence of color burst.